In this work, we perform an extensive numerical investigation of the heat transfer behavior of nanofluid laminar flows, in wavy-wall channels. The adopted computational approach is based on a finite-volume formulation of the lattice Boltzmann method constructed on a fully-unstructured mesh. We show the validity and effectiveness of this numerical approach to deal with realistic problems involving nanofluid flows, and we employ it to analyze the effects of the wavy-wall channel geometry on the rate of heat transfer, thus providing useful information to the design of efficient heat transfer devices. Results show that an increasing of the wavy surface amplitude has a positive effect on the heat transfer rate, while a phase shift between the wavy walls leads to a decreasing of the mean Nusselt number along the channel. The addition of solid nanoparticles within a base liquid significantly contributes to increase the rate of heat transfer, especially when a relatively high value of nanoparticles volume fraction is employed. The present analysis then suggests that the use of nanofluids within an axis-symmetric configuration of the wavy-wall channel, with high wavy surface amplitude, may represent an optimal solution to enhance the thermal performances of heat transfer devices.

在这项工作中，我们对波状通道中的纳米流体层流的传热行为进行了广泛的数值研究。所采用的计算方法基于在完全非结构化网格上构造的格子Boltzmann方法的有限体积公式。我们展示了这种数值方法处理涉及纳米流体流动的实际问题的有效性和有效性，并且我们将其用于分析波浪壁通道几何形状对传热速率的影响，从而为高效设计提供有用的信息。传热装置。结果表明，波状表面振幅的增加对传热速率具有积极影响，而波状壁之间的相移导致沿通道的平均努塞尔数减小。在基础液体中添加固体纳米颗粒显着有助于提高热传递速率，尤其是当采用相对较高的纳米颗粒体积分数时。然后，本分析表明，在波浪壁通道的轴对称配置内使用具有纳米波表面幅度的纳米流体，可以代表增强传热设备热性能的最佳解决方案。